Indeed, they planned their plot, and their plot was with Allah, though their plot was a great (one, still) it would never be able to remove the mountains (real mountains or the Islamic law) from their places (as it is of no importance) [Tafsir Ibn Kathir, Vol. 2, Page 597]. [It is said by some interpreters regarding this Verse that the Quraish pagans plotted against Prophet Muhammad SAW to kill him but they failed and were unable to carry out their plot which they plotted].
और वह लोग अपनी चालें चलते हैं (और कभी बाज़ न आए) हालॉकि उनकी सब हालतें खुदा की नज़र में थी और अगरचे उनकी मक्कारियाँ (उस गज़ब की) थीं कि उन से पहाड़ (अपनी जगह से) हट जाये